Pressure-fluid motor



Septgz. 1924.

G. H. GILMAN PRESSURE ELUID MOTOR Original Filed Dec. A31 1917 Ilm.

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` UNITED STATES YPATaN'r OFFICE.

` Gnoaean GILMAN,'0F BosToN, MASSACHUSETTS, AssIGNoR To SULLIVAN 1*MACHINERY COMPANY,- A CORPORATION or MASSACHUSETTS.

vramsUaE- ismrrn moron.

Application tiled December 81, 1917, Serial No. 209,791. RenewedNovember 5, 1928.

Be it known thatl, GEORGE H. GILMAN, a citizen of the United States,residing at Boston, in the county of Suifolkvand State of Massachusetts,have invented certain new and 'useful Improvements in Pressure-FluidMotors, of which the following vis a full,

clear, and exact specification.

My 'invention relates to pressure fluid,I motors. f

It ha s`jforv its objectl to' provide an. improved pressu'reliuid motor.`A- further -ob- ]ect of my inv enti'on is" to provide an improvedpressure 'fluid motor whichusespecially adapted to use in `ajfpercussivetool, and which 'is of an improved construction `adapted to increasematerially thecutting i speed ofthe tool and at the 'same time elimiline2-2 `of Fig.

nate all .diiculty with the piston-striking the heads of the cylinderforwithsticking of the piston within the cylinder. -still further objectof-'my invention is to pro-` videan improved motor of the valveless typewherein 'at' the same time that operation of the motor j=is improvedhtheconstruction is simplified in such a manner that the vsame maybemanufactured at small expense. Otherl objects and advantages` o f myimproved'. construction will, however, herein# after more fully appear.

In 'order thatfmy invention may-be dis! closed, I have shownffor4purposes of illustration inthe accompanying drawings, one embodimentA'which f my invention may as-l sume" in" practice. 1

Fig. 1 is av longitudinal sectional view of a percussive tool equippedwith myA ini-prove.- ment, the sectionbeing taken on line 1-1 of. Fig.3, and the piston being shown in one extreme position.

Fig. 2 is a similar sectional view taken on the .piston being shown inits otherA extreme position.

Fig.' 3`is a transverse sectional view taken on line 3-3 of Fig. 1.

Fig. 4s 's a transverse sectional -view taken on line 1f-4 of'Fi'g. 2. f

In this illustrative construction, itvwill be observed that I have showna motor cylinder 1 having therein Va piston 'comprising a short fronthead- 2 and a referably longer -rear head1. As shown, t ese heads 2 and3 are Y spaced apart by a reduced portion 4, and

' tively, with front and rear pressure surfaces jand 6 of-dii'erentarea,the rear area 6 bein materially larger than` the front area 5. in ausual construction, .this piston operates between the rear'cylinder head7 and the front cylinder head 8, and is also provided on its front endwith' a forwardly extendin reduced hammer portion 9 reciprocable t roughthe front head into engagement' with the-rear end of a tool 10 carriedin a suitable chuck. It will also be observed that, as usual, ressurefluid is supplied'to the rear head through a supply ipe v12 under the.control of a valve 13, and t at the front and rear heads are connectedb .the

usual side 'rods .14, preferably resiliently mounted, as shown at 15. In-the construction shown, the pressure iuid supply is'conducted throughsuitable passages (not shown) from the'supply pipe 12 to a plurality oflongitudinally disposed inlet passages 16 disposed within the cylinderwall and at opposite sides of the rear end of the cylinder. As shown,each of these Ainlet passages 16 is. also rovided with a .lateral uidpressure supp y ort 17 at its front end o ening into .the cy inder at apoint interme iate its ends but preferabl slightly nearer the rearendthereof. As i 4lustrated,.a longitudinally disposed ort'18,

preferably of reduced diameter, is a so provided in a'suitable septum 19at the front end of each of the inlet ypassages 1 6, which port 18 inturn communicates with a longitudinally, disposed elongated reservoir orpressure fiuid storage' chamber. 20 forming an extension of the 4inlet'passageand similarly disposed within the lines of the cylinder casing.Each of these chambers 20 is in turn Aprovided at its rear end" with alateral port 21, constituting a fluid pressure supply port for thecylinder and referably of substantially the samesize as t e port 17,

which Vis adapted to communicate with the cylinder, preferably at a'point..closel{eadj ing jacentv that port, the same herein shown as oening into the cylinder "on the opposite si e of the septum 19.In-'the-form of the invention here illustrated, a plurality .ofcooperating longitudinally disposed'pas-- vSages 22 are also provided inthecylinder wall opposite the "assages A16 andat the `rear end of the cyindex-. As' show'ii,'acli of these passages 422 is also provided at .its

susl

opposite ends with lateral ports 23 and u the cylinder'atapointfadjacentthe front .25

.front head of the piston. the'only 'piace to which air may tlowfrom te`\ inlet theopposite end of the cylinder casing fromthe passage: 22,the same herein being shown to be located in such a manner as to form acontinuation ofthe passage 22 but to be separated therefrom by asuitable se tum. 26. In the form of my Ainvention s own" herein, each ofthese passages 25 is provided at its rear end with a plurality oflateral inlet ports communicating with the cylinder and herein shown toinclude a small, port 27 closely adjacent the rear end of the passage 25and an adjacent largerport 28. It will also -be observed that eachof thepassages 25 is provided at its Yopposite end with Vanother lateral` port29 communicating with end of the latter, and that this port 29 is inturn provided with a' constantlycommunieating leakage (port 30 leadingto the extreme front en of the cylinder. .As in a usual constructiomfitwill of course be understood that exhaust ports 31 and 32 are alsoprovided .in the opposite ends of the cylinder -in order to cooperatewith the piston and to be controlled thereby in rmitting the escape of'exhaust pressure uid from the cylinder.

In theoperation of my improved construction illustrated, when pressurefluid is admitted to the inlet passage 16 with the piston in thevposition shown in Fig. 1, the pressure fluid will iiow into the chambers2() through the restricted openings 18 and throu h the port 17 into thespace surrounding t e reduced ortion 4 of thel'piston. From this space1t will be conducted .by ports 23, passages 22,-and ports 24' to therear pressure -surface 6 of the piston.` As a result of the pressureacting up on. this surface, the piston will move forward, i. e., to theright in Fig. 1, and cause the rear head 3 offthe piston to close theports 23.

From this-moment to the completion of the forward stroke, the pistonwill move under the influence of expansion of tli'e motive iuidin therear end of the cylinder. From the instant when ports 23 are close'd tothe instant when -ports 27 are opened by the will be through ports 18,and also from ports 17 through ports'21 by 4way of the groove in thepiston, into the storage hambers 20. These chambers will laccordingly befilled with duid substantially at inlet pressure. When the ports 27 areopened, there will be: amomen'tary rush of live fluid across the groovein the piston from ports 17 and ossible' through ports 27 passages 25.-Avery slightV movement of the vpiston will, however,`

orts 17 and thereafter all the presclose sure uid conducted to the frontend of the cylinder, .other than'that already stored m chambers' '20,must-pass through ports 18.

As the piston moves forward, there will be'l an expansion ofthe pressurefluid in'chamf. `ber 20 through ports 27 and28, assa'ges 25 and ports429 intothe front en of the cylnderand the cushioning action of thispressure-Will be somewhat reduced by. the

factl that the pressure so acting is'onlyv the fluid expandingout ofchambers 20, sup lemented bythe volume which can' d )ow 'through Vtherestricted passages 18, rather -than fluid ports equivalent 1n. area toports 21.

Shouldthe piston move far enoughl forward,

as may occur withtlie portsf21located as shown', the pressure tluidwithin the groove ofthe piston, in passages 25,and'ii i' the frontV end.of thef cylinder will `becut -off from oommunioaton with tho supply andSomowhat compressed as the movement `of the piston continues after`ports 21 havebeen ive duid flowin 'directly from-live overrun, butthe.workoffthegcompression of this fluid willbe returned to the istonuon `the rearward stroke. Itshould) bonner-- stood, l-asindlcated in.Figrtliattheports 21 vis closed only at, or after, the moment 'ofimpact, .and accordingly this 4 compressive action will occur to a muchless degree 1n.v drilling than 4wil1b etl1 e case-in the event that themotor is being,run-idly, i.- e., without a steel in the chuck. Infact,it vwill be obvious that due to the usual variation in theshank lengthof `hand sharpened steels as turned out by the ordinary mine smith, theports 2 1- willbe' caused t9 be losed by los a Small margin, f-o-oloseline and lino, or

oven to bo Slightly-open@ the moment of impact. Upon thoroturn Strokeofthe-pia ton, the ports 21 will again ,be Opened and asthe vo ume inthe front end of the cylin der increases, the Pressure Huid in thestorage chambers 2O willv continue to expand around through passages 25to act on the frontend of the piston, Thisuid from the storage chambers2O will be lsupplemented by live fluidentering throuoh the ports 18, butit will be understood time the Size of these ports being relativelysmall the rate of -flow lthrough the ports 18 may be insufficient to,maintain'the rassure in the front end'of the cylinder as igh as thepressure the passage 16 and so that a partial expansion may-occur in thefront end of the glindolj Prior to tho Ao losng of the port-S This,however, will de end on'the flow areas ofthe ports. 18, which, asindicated above, may be varied to suit 4different purposes.

Justat the momentof closure of these ports, there Pwill be anothermomentary Y 17. After the closure of orts 27, the stor age chambers 20'vvill--beic arged with fluid up to" full pressure and upon opening ofports 23, fiuid willagain pass to the rear end ofthe cylinder to cushionthe 1piston aud again cause itsforwardstroke. uring the 5 size equaltothat of passages 16, Since .the passages-@18 are of .afreduced area,they are unable to supply viiuidto the 4forward end "of thecylinder at'as f'greatpa rate as wouldl 'bei-the case were Huid 'toow directly from'theinlet passages 16 to the po'rts'21 -without restricted bores between'these points. It will be understood thatthe piston is-'moving withmaximum Jvelocityat Vthe moment when the ports' 27S arebrought incommunication with "-ports2l and4 that 'during the exceedingly minute-'fraction` fof 'a' second between thls .moment and the moment when the istroke `is"co1iipleted, but little more fluid can How; into Vthechambers through ports 18 and# accordingly -a le'ssldegree of cushionpressure will re'sult than would Abe the case were the'pass'a'ges 18larger. During the 'intervalwhen the piston is at the frontend of thecylinder-and4 reversing Aits travel, `the Apressure in chambers 20.' maybe materially raised. f Durin the rearward stroke, the

pressuretrans'mltted to-the front end of the ut 'owingftoz the smallsize of the .ports 18,

thev pressure -'may a ain lbegin toA fall off somewhat prior'to t eclosing .of the ports' 27 andfrom fthe vn ioment. when the ports27--areclosed until the4 piston vreaches the 'rearcnd Ofitsstmke, `theaction will be entirely expansive. `It -shouldf be understood 'that theports 27 are 'offsuch' small size as standpointofpre-admission and alsofrom.

the .standpoint of. the supply of fluid direct from vports 17 during;the return stroke. The ports 18 are so designed, as a result of tests,.'that the drilling speedis'a maximum in lproportionto air consum tion,that area I being used where the best o set .is foundbev tweenhighcushion.- resulting fromfpre-admission and lack of iiuid in suicientquantity `to eiiect a satisfactorily rapid return strokezg l v" Intheuse fof my improved motor in con- Ynection with a precusslve drill,it'has been* found that-not only the power of the blow,

Abut the' number of blows obtainable in a given time, has beenmateriallyincreased in such amanner as phenomenally lto increase thedrilling eed.It has also been found that, even a ough live air' Iis admitted toistonwill accordingly be somewhat higher,

the piston at different times in its operation,

the air consumption i's thereby only j increased to such a minor degreeas to b e insignificant when the increased drilling speed is considered.It has also been demonstrated that through the utilization of my.improved construction includingthe chamber 20, it has been possible toprovide'an additional supply ofair which acts effectiv'elv-tol increasethe speed of the piston on. its'rearQ v ward stroke without in any waylreducing the eiec'tive pressure in the in'let, Through the provisionofmy improved port arrangements including the connections to the` liveair supply and the chamber 20, it hasalso been found thata proper degreeof cushion is provided for the frontend of thef piston under allconditions ofoperation and that through the provision of my'improvedcon` nections controlling the supply of Huid to the -rear end of thepiston, an effective cushion isA produced tending to cushion the pistonin its rearward stroke.' Throughthe provlsion of my improvedconstruction including the`v port 30, it has'also been found that anydiiiicultyl with the sticking of the piston within the cylinderatA theforward limit of its movement is also eiectually over` come. These'andother advantages of my improved construction will, however, be

clearly apparent to those skilled in the art.

'reciprocation' of said piston including a plurality of fluidypressuresupply -ports having direct. communication with a ysource ofpressure through passages of different How areas, and means forconnecting said supply'ports with the ends of the cylinder;

2. In a. pressure iuid motor, acylinder, a piston therein, and meansvfor effecting reclprocation of said piston including a plurality offluid nressure supply ports having direct communication lwith a sourceof pressure through `passages of different ow areas, and means forconnecting each of said supplyports with on'e end of said cylinder. 'l'

.3. In a essure fluid motor, a' cylinder, a'plston t erein, and meansfor el'cctln'g reciproctionof said piston including a plurality of fluidpressure supply 4ports having direct communication with a source ofpressure through passages of diii'erentjjliow l Aeo `en s of saidcylinder.

6. A valveless fluid pressure percusslve motor comprising a cylinder, apiston thereinl areas, and meansfor alternatel connecting.

each of said supply ports with th ends of said c linder.

4.Y a pressure lluid motor, :a cylinder,

sure supply ports, -one of which is provided with ai supply passageadapted to com'muni- .cate directly with .the source of fluid pressure'and the other of which is connected with said supply passage by "apassage of less flow area than said supply passage, and means forconnecting said supply ports with the ends .of the cylinder.

5. A valveless iluid pressure percussive motor comprising a cylinder, apiston therein having heads of equal diameter separated by a reducedportion to form a. groove, a pair of longitudinally separatedv 'fluidsupply ports, and a pairof longitudinally` separated fluid distributionpassages com' municating With'the bore of said cylinder at the oppositeends thereof andalso-b ports at points between the most adjace t edesofsaidiluid supply ports andthe having heads of equal diameterseparated byv a reduced portion forming a roove, a pair oflongitudinally separated uid supply ports, and a pair of longitudinallyseparated fluid distributionpassages communicating with the lbore ofsaid cylinder at the opposite ends thereof and also by. ports at pointsbetween the niost adjacent edges of said. uid supply ports and the endsof said cylinder, one of said passages communicating with said cylinderbore-also by a port intermediate one of said' last mentioned ports andthe end of the cylinder.

7. A. valveless fluid pressure percussive motor comprising a cylinder, apiston therein having heads of equal diameter separated by a reducedportion forming a oove, a pair of longitudinally separated arated fluiddistribution passages communicating with the bore of said cylinder atthe opposite ends thereof and also hy ports at points between the mostadjacent edges of said fluid supply ports and the ends of said cylinder,both of said passages 1oeing connectible hysaid piston groove with bothof said iluidpressure supply ports.

8. Ina valveless pressure fluid motor, a cylinder, a piston thereinhaving a peripheral roove,'and means for effecting Areciprocatlon ofsaid piston including a pair of longitudinally spaced lateral fluidpressure supply'ports provided with means for direct connection to avsource of iiuid pressure supply, and means for alternately connectingboth of said' ports to each endof said uid supply ports. and a pair oflongitudinally sepcylinder comprising Adistribution passages adapted tocooperate withthe peripheral groove in said piston.

.9. In a pressure vfluid motor,.a cylinder, a piston therein having aperipheral groove, and means for effecting reciprocation of said pistoninclud' a 'pair of longitudinally spaced lateral uid v pressure supplyports l provided with means forfdirect connection to a source of`lluidpressure su ply, and bypass passagesleading to the en of saidcylinder and connectible with-said supply ports b said peripheralgroove, both of said portsing immediately co'nnectible` with each ofsaid bypass passages upon initial admissionto the latter'through saidroove.- 10. In apressur'eduid motor,- va cy inder,

' a piston thereinhaving a plurality of-heads, and means forreciprocating said piston including a plurality oflateral fluid.pressure supply ports each fof which. is successively opened and closedby one ofsaid heads and one of whichfisv successively opened andclosed-'by the other head and cooperating passages for delivering fluid-from said supply -portsto theI opposite. en'ds of Asaid cylindex,...A IJij-v if.: I 11.'. In a-'pre'ssure"'lluid"motor,` a cylinder, xa piston'thereini having aplurality. of heads, and means for reciproc'ating saidiston including' a plurality of lateral flui pressure supply ports eachof'which is successivelyv openedand closedbyone of said' heads and oneof' which is successively opened and closed' bythe other head andcooperating passages leading to thefopposite ends of lsaid cylinder andhaving their communication with,v 'said supply ports controlled by said*I iir'st mentioned head.-

12. In a .pressure fluid motor, a cylinder, a piston therein havingheads ofequal diameter, and means for reciprocating said Hpistonincluding .af plurality of .lateral pressure .supply :ports controlledby said! piston and communicating' with one another uid.

.through a assageof'less llow areathan the l area of eit er of'said-ports, and means for conducting fluid from said supply ports tothe ends of tlre'cylinder.-

13. In a pressure fluid motor, a cylinder,

age chamber, -and meansY includinga plu- '125` rality of passagesfor'conducting fluid from said supply ports to the ends of the-cyllnder.n -b 14..l In a-pressure iluid motor, -a cylinder,

a piston therein having a plurality of heads spaced apart by aperipheral groove, and

af piston therein having a plurality of heads means: for reciprocatingsaid .piston including a :plurality of` passages communicating with theends of the cylinder and a plurality ofadjacent lateral uid pressuresupply ports, .one having a communicating pressure iiuid,stora'gechamber communicating with the other andvboth of said orts beingcommunicable with bothrv of distributing passages. Y

, .15. In a 4 pressure iluid motor, a cylinder, aupistoutherein havingheads of equal` diameter, `and means for reciprocating said.

piston including a pair of lateral fluid presa'. suresupply ports one'of which is opened 5 byf'one of said heads as it moves in one directionandV both of which are thereafter successively closedby-the other head.A

1 6.v Ina pressure fluid motor, a. cylinder,

t a'rpistontlierein. having. a plurality of heads spaced by an .annulargroove, and means for reciprocating said piston including a pair oflongitudinallyspaced lateral fiuid pressuresupply perts controlled-bysaid pistonv and .cooperating passages coiinectible4 by said pistonsimultaneously with both of said pressure supply ports and-oper'ative.to conduct fluid to the ends of said cylinder.

v .17. In a pressure fluid motor," a cylinder, 1, a piston'th'ereinhaving a plurality of heads separated by ani-annular groove, and meansfor reciprocating said. piston -including a plurality of fiuidpressuresupply ports suc- I' cessively closed by one head of the piston and`bypass passages leading 'to -theends of said cylinder, one of saidbypass passages havinga'- plurality of ports successively opened'. bythe other tPiston head.

18. In apressure uidA motor', a cylinder, a piston therein having headsof equal diameter, and means for reciplcating said pistonineludingaplurality o f lateral iuid pressure supply ports successively closed byone head of Said piston, and bypass passages v leadingto the ends of thecylinder, one of said bypass passages having a plurality of ports ofdifferent size successively opened by the other piston head.

19. In a pressure fluid motor, a cylinder, zi piston therein havingheads of equal diameter, and means for reciprocating said pistonincluding a plurality of lateral fluid pressure-supply portseach ofwhich is sucopened and closed bythe other headand cooperating' passagesleading to the opposite ends ofi said cylinder and having theircommunication with saidsupply ports oontrolledbys'aid first-mentionedhead.- t

21. In a pressure fluid motor, a cylinder,

a piston' therein hav' heads's `aced by a.

mg P

peripheral groove, and means for reci recating-said pistonin onedirection inc uding apair of ateral fluid pressure supplyportscontrolled by said piston and both adapted tovbe closed thereby in onesition thereof, and a plurality of cooperating distribution passagesleading to the ends'fthe cylinder,

one of .said .distribution A passages having-a plura'hty; ofportssuccessively opened ,byoiie of said eads prior to the closure ofboth of said supply ports.

22. In a pressure Huid moto-r, cylinder,

a pistontherein having heads separatedlby an .annulargroovq andmeansforreii eating said piston 1n one direction inclu controlled bysaidpiston and both adapted to be closed by one head thereof in oneposition thereof, and a plurality o f *cooperat ports of different sizeleading'to oneend 'o said cylinder and,V successively openedlbyI theother of said. heads .prior tothe closure of both'said supply `ports bythe first mexitioned head.

23. -In va pressure fluid niotor,i`a,cylinder,'

a piston'therein havingheads spaced apart by an annular groove, andmeans for reci- .rocat1ngsa1d piston in one direction inclu 'ro' ,ing apair of lateral fluid pressure supply ports ing 'a pair of communicatinglateral fluid pressure supply ports successively closed by one -head ofVthe piston, .and a plurality" of cooperating ports of different sizeleading to the other-end of the cylinder and successively opened in theor ing size'by the other of said heads prior to der of their increas theclosure of both of the supply ports byv the first mentioned head.`

24. In a pressure iiuid motor, a cylinder,"

a piston therein having heads of equal diameter, and means forAreciprocatingA saidpiston including a plurality of .longitudi--- nallyspaced lateral Huid pressure supply ports one communicating with'asource -of pressure fluid supply and the other communicating through apressure-'chamber with said source and coo erating passa s leading tothe opposite en s of said cylin er one having a ort extending to .theextreme end of said Icy inder. ,l

25. In a pressure `fluid motor, a cylinder,

a piston therein having heads of equaldi rio ameter, and meansforreciprocating said piston including a plurality of"'longitudi nallyspaced lateral. Huid prcssuresupply ports one communicating' with a,Source of pressure Huid supply and the other cmmunicating through apressure chamber with said source, cooperating passages lead- I ingtothe opposite endsof said cylinder one a piston therein,

ISO-la piston therein,

having a port opening into said cylinder and adjacent one end of thesame and a conistantly communicating port extending to the extreme endof said cylinder, and means for connecting said cooperating passageswith said fluid pressure supply ports.

, 26. In a pressure 'fluid motor, a cylinder, a piston therein havingheads of equaldiameter, and means for reciprocating said pistonincluding a plurality of lateral fluid pressure supply ports each ofwhich is successively opened'and closed by oneof said heads and one ofwhich is successively' and closed by the other head and cooperatingpassages leading to the opposite' ends of saidfcylinder and having theircommunication with said supplyports successiinely closed and thereaftersuccessively opened by said first mentioned head.

27. In a pressure iiuidmotor, a cylinder,

and means for reciprocating' said piston including a plurality laterialiuid 'pressure' supply ports, and cooperating passages leading to theopposite ends of said cylinder, one of said passages having an inletport spaced longitudinally from said supply. rts.

28. In a pressuiisoiuid. motor, a cylinder, and means for reciprocatingsaid piston including a plurality1 o f lateral iuid pressure supplyports, and cooperating-passages leading tothe opposite ends of saidcylinder, said passages having inlet ports spaced longitudinally romsaid .Supply Ports- 29. In' a pressureluid motor, ar cylinder,

a piston therein, and means for reciprocat- 1 ing said (piston includinga plurality of lateral flui pressure 'supply ports, and cooperatinpassages leading to the opposite ends of sai cylinder, one of saidpassages having Acis a Aplurality of inlet ports spaced longitudinallyfrom said supply ports.

30. In a. pressure fluid motor, a cylinder,

a piston therein, and means orreciprocatf ing said iston including apluralityoflateral flui pressure supply ports, and cooperating passagesleading to the opposite ends of said cylinder,.one of said passageshaving a plurality of inlet orts of different size spaced longitudinallyFrom said supply ports.

31. Ina fluid pressure percussive motor,

, a cylinder, -a piston therein, and means for effecting .reciprocationof said piston including a main fluid pressure supply port, an auxiliarypressure iuid supply port sepv arated therefrom longitudinally of thecyl'- inder, :a restricted passage connecting said ports, and a bypasspassage leading to one end of the cylinder cooperating with saidauxiliary inlet port.

32. A iuid pressure motor comprising a cylinder, a piston therein, andiuid distribu- Leonora.-

source of uid supply. of

ing to theends `of thel cylinder,.and,supply means for said distributionports including a fluid pressure supply port provided with a supplypassage having therein a restricted orifice.

33'. A iuid pressure-.motor comprising a cylinder, a piston therein, andfluid distribution means including a fluid pressure supply port adaptedto be brought into'communication with one end Vof the cylinder,andlpassage meansuof less iow capacity than lsaid supply port `to-c'onnect itwith a source of Huid supply. Q

34. A iiud pressure motor-comprising a. cylinder, a piston therein, andfluid distribution means. includ' a fluid pressuresupply port adaptedtobe rought alternately into communication with the opposite ends of thecylinder, and means of less iow capacity than said supply portto'fconnect it with a 35. A fluid pressure motor comprising a fectingreciprocation' of said piston including a fluid pressure Vstoragechamber'having aport adapted to be brought into communication with one.end of. the cylinder, :and means for charg" g said ,storage chamberprior to 's aid communication.

- tionmeans including distribution ports leadcylinder, a piston therein,andmeans 'for ef- 36. A fluid pressure motorl comprising a' cylinder," apiston' therein, Yand means for efecting reciprocatioii'of saidpistoniiicluding a iiuid pressure storage chamba-.having a port adaptedto be brought into communication with one end o the cylinder, and meansfor charging said storageV chamber prior to and during saidcommunication.

'37. A fluid pressure motor comprising a cylinder, a piston therein, andmeans for effecting reciprocation of 'said piston including a fluidpressure storage chamber having a port adapted to be brought intocommunication with .one end of the cylinder, and

means for charging said .storage chamber comprising means to vconnectsaid port with a fluid sup ly', prior tothe communication with the en ofthe cylinder.

38. A Huid pressure motor comprising a cylinder, a piston therein, andmeans for l effecting reciprocation of said piston including 'a fluidpressure storage chamber having j a port ada `ted to be brought into'communi- .cationl wit one end ,ofthe cylinder, and means f or charginglsaid storage chamber comprising means formed in said piston to connectsaid port with a fluid supply prior to the communication 1with the endof the cylinder. l

L39. A iiuid pressure motor comprising a cylinder, a piston therein, andmeans for effecting reciprocation of said piston including a fluidpressure storage chamber having a port adapted to be brought intocommunication Wit one end of the cylinder, and

means' for charging said storage chamber comprismg means to connect saidport with a Huid supply during its communication with one end of thecylinder.

40. A fluid pressure motor comprising a cylinder, a piston therein, andmeans for effecting reciprocation of said piston including a fluidpressure storage chamber having a port adapted to be brought intocommunication with one end of the cylinder, and means for charging saidstorage chamber comprisingneans to connect said port with a fluid supplyduring its communication with the other end of said cylinder.

41'. A iiuid pressure percussive motor comprising a cylinder, a pistontherein, and means for distributing fluid to effect reciprocation ofsaid piston including fluid distribution ports leading to the oppositeends of said cylinder, fluid pressure supply means comprising an inletport, and a storage chambe` having a port adapted to be brought intocommunication with said inlet port and With-one end of said cylinder inalternation.

42. A fluid pressure percussive motor comprising a cylinder, `a pistontherein, and means for distributing iuid to eii'ect reciprocation ofsaid piston including fluid distribution ports leading to the oppositeends of said cylinder, and iluidpressure supply means comprising aninlet port and a storage chamber communicable with an end of saidcylinder when said inlet port is closed and having a port adapted to bebrought into communication with one end of said cylinder' and with saidinlet port simultaneously.

43. A liuidpressure percussive motor comprising a cylinder, a pistontherein, and means for distributing Huid to eilect reclprocation of saidpiston including fluid distributionports leading to the opposite ends ofsaid cylinder,

ber communicable with an end of said cylinder when said inlet port isclosed, and means to conduct fluid pressure from said inlet portsimultaneously to said storage chamber and to one end of said cylinder.

44. A fluid pressure percussive motor comprising a cylinder, a pistontherein, and

uid pressure supply means' "comprising an inlet port anda storagechammeans for distributing fluid to effect reci rocati'on of said pistonincluding liuid d1stribution ports leading to the opposite ends of saidcylinder, fluid pressure supply means comprising an inlet port and astorage .chamber communicable with an end of said cylvinder when saidinlet. port is closed, and

pass of said piston and to communicate with an end of said ceeding pass.

46. A lluid pressure percussive motor comprising a cylinder, a pistontherein, and means for distributing fluid to eil'ect reciprocation ofsaid piston including fluid ld1stribution passages leading to theopposite ends of said cylinder,'iluid pressure supply means comprisingan inlet port anda Stora e chamber communicable with an end of saldcylinder during the next succylinder when said inlet port is closed, andv means for connecting said storage chamber with said inlet port andsubsequently with one of said distribution passages.

47. A fluid pressure percussive motor comprising a cylinder, a pistontherein, and means for distributing fluid to elect reciprocation ofsaidv piston including fluid distribution passa es leading to theopposite ends of said cy inder, fluid pressure supply means comprisingan inlet port and a stora e chamber communicable with an end of saidcylinder when said inlet ort is closed, and means for connecting said3storage chamber with said inlet port and with one end of said cylinder,closing said last mentioned connection and reopenin the same during acycle for one end of sai cylinder. i

In testimony whereof I affix my signature.

` GEORGE H. GILMAN.

